CVE-2019-6749 in Studio Photo
Summary
by MITRE
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Foxit Studio Photo 3.6.6. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of EZIX files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-7638.
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Analysis
by VulDB Data Team • 09/26/2023
CVE-2019-6749 represents a critical buffer overflow vulnerability affecting Foxit Studio Photo version 3.6.6 that enables remote code execution through improper handling of EZIX file formats. This vulnerability resides within the software's file parsing mechanism and demonstrates a classic weakness in input validation that aligns with CWE-121, which addresses buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The flaw specifically manifests during the processing of EZIX files, which are typically used for image editing and manipulation within the Foxit Studio Photo environment.
The technical exploitation of this vulnerability requires a user to interact with malicious content, either by visiting a compromised webpage or opening a crafted malicious file that contains specially formatted EZIX data. This requirement places the vulnerability in the category of user-initiated attacks, similar to those described in the ATT&CK framework under technique T1203 for Exploitation for Client Execution. The root cause stems from inadequate validation of user-supplied data during EZIX file parsing, creating a scenario where memory allocation boundaries are exceeded, resulting in a write past the end of an allocated buffer structure. This memory corruption allows attackers to manipulate program execution flow and potentially execute arbitrary code with the privileges of the current process.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a foothold that can be leveraged for further system compromise. The vulnerability's exploitation potential aligns with the ATT&CK technique T1059 for Command and Scripting Interpreter, where the executed code can be used to establish persistence, escalate privileges, or conduct additional reconnaissance activities. Attackers can craft malicious EZIX files that trigger the buffer overflow when processed by the vulnerable software, potentially leading to full system compromise if the software runs with elevated privileges. The vulnerability affects systems where Foxit Studio Photo is installed and actively used, particularly in enterprise environments where image editing software is commonly deployed.
Mitigation strategies for CVE-2019-6749 should focus on immediate software updates from Foxit, as the vendor has likely released patches addressing the buffer overflow in their subsequent releases. Organizations should implement network-based restrictions that prevent access to untrusted websites and file downloads containing potentially malicious EZIX files. Additionally, user education programs should emphasize the importance of avoiding suspicious file attachments and web content, particularly when dealing with image editing software. System administrators should consider implementing application whitelisting policies that restrict execution of unauthorized software and monitor for unusual file processing activities. The vulnerability's classification as a remote code execution flaw necessitates comprehensive network segmentation and endpoint protection measures to prevent lateral movement once initial compromise occurs, aligning with ATT&CK techniques for privilege escalation and defense evasion. Organizations should also conduct thorough vulnerability assessments to identify other potentially vulnerable applications that might share similar parsing mechanisms with the affected software.